I mean, by their definition it is a database, but i can understand your usage. Then again, they both say it is a database, and in your link, they say it "isn't quite there yet", so /shrug heh.
It'd be fantastic to combine something like noms with https://arrow.apache.org/ and then use Spark/Drill/Impala to query it.
The linked page says, as its last line, "many important features are not yet implemented including a query system."